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690 results for “Geometric morphometric”
Fig. 4 in Sexual dimorphism and population differentiation in the Chilean Neotropical moth Macaria mirthae (Lepidoptera, Geometridae): a wing geometric morphometric example
Fig. 4. Discriminant analysis of the wing shape between the two Azapa (grey bars) and Chaca valley (white bars) at the Atacama Desert.
Figure 7 in Discrimination of the sister hedgehog species Erinaceus concolor and E. roumanicus (Erinaceomorpha: Mammalia): a geometric morphometric approach
Figure 7. Multivariate regression analysis of shape variables vs centroid size of the mandible (closed circle: E. concolor, n = 54; open circle: E. roumanicus, n = 14).
Figure 3 in Discrimination of the sister hedgehog species Erinaceus concolor and E. roumanicus (Erinaceomorpha: Mammalia): a geometric morphometric approach
Figure 3. Box and whisker plot graphics showing variation of centroid size for dorsal cranium (a) and mandible (b) between the two species.
Figure 1 in Discrimination of the sister hedgehog species Erinaceus concolor and E. roumanicus (Erinaceomorpha: Mammalia): a geometric morphometric approach
Figure 1. Collection localities for all hedgehog specimens used in this study from Turkey. Closed circle: E. concolor and open circle: E. roumanicus. Numbers in parenthesis refer to the sample sizes for the dorsal cranium and mandible, respectively.
Figure S1 in Discrimination of the sister hedgehog species Erinaceus concolor and E. roumanicus (Erinaceomorpha: Mammalia): a geometric morphometric approach
Figure S1. Ba–c) Landmarks recorded on the dorsal surface of cranium in E. concolor and E. roumanicus, respectively. b–d) Landmarks recorded on the mandible in E. concolor and E. roumanicus, respectively.
Figure 2 in Shape variation in head scales of species of the genus Ophiomorus DUMÉRIL & BIBRON, 1839 in Iran, a geometric morphometrics approach
Figure 2. Map of the localities of Ophiomorus species in Iran analyzed in this study. Stars indicate specimens referred to OTUs.
Fig. 3 in Differentiation of Trichuris species eggs from non-human primates by geometric morphometric analysis
Fig. 3. Factor map corresponding to Trichuris sp. eggs derived from different host primate species: macaque (M. sylvanus), colobus (C. g. kikuyensis), grivets (C. aethiops) and the Brazza's monkey (C. neglectus) from zoos in Spain. Samples are projected onto the first (PC1, 61%) and second (PC2, 18%) principal components. Each group is represented by its perimeter. Circles represent the centroid in each community.
Data from: Geometric morphometrics dismiss the polymorphic Hydrocotyle quinqueloba (Araliaceae) from the neotropics
Hydrocotyle taxonomy is poorly resolved due the traditional assessment of leaf morphology that has imposed difficulties to species delimitation and prompted the recognition of several infraspecific taxa. Hydrocotyle quinqueloba comprises ten infraspecific taxa that differ mainly by the shape of their leaf blade. The species occurs in montane forests of the Andes and eastern Brazil, along the Atlantic forest and Cerrado domains. However, the geographic distribution of the taxa under H. quinqueloba is poorly known, and their supposedly continuous morphological variation remains unverified. Here we analyze the morphological variation and documented correlated differences in geographic distribution of H. quinqueloba to assess whether they support the delimitation of distinct species or the recognition of infraspecific taxa. For this task, we applied landmark-based geometric morphometrics (GM) to leaves and traditional morphometrics to other structures of specimens of H. quinqueloba. Procrustes analysis of variance (Procrustes ANOVA) indicated that variation of leaf blade shape was weakly associated with geography and was mainly explained by taxa themselves. In contrast, variation of leaf blade size was significantly (p < 0.001) associated with geography, but variation at the specimen level could account for it. Principal component analysis (PCA) of leaf blade shape indicated that taxa differed mainly by the angle and relative size between median and lateral primary veins, by the space between the petiole insertion and middle lobe's sinuses, and by the width of middle lobe's base. Canonical variate analysis (CVA) indicated significant (p < 0.01) differences among seven infraspecific taxa that formed groups defined by leaf blade shape. Linear discriminant analysis (LDA) of 11 morphological characters separated five groups of taxa, which displayed significant (p < 0.001) differences among each other. Based on that, we propose an updated taxonomic treatment that restricts the circumscription of H. quinqueloba to plants from the Andes and accepts four species from eastern Brazil.
Data from: Studying developmental variation with Geometric Morphometric Image Analysis (GMIA)
The ways in which embryo development can vary across individuals of a population determine how genetic variation translates into adult phenotypic variation. The study of developmental variation has been hampered by the lack of quantitative methods for the joint analysis of embryo shape and the spatial distribution of cellular activity within the developing embryo geometry. By drawing from the strength of geometric morphometrics and pixel/voxel-based image analysis, we present a new approach for the biometric analysis of two-dimensional and three-dimensional embryonic images. Well-differentiated structures are described in terms of their shape, whereas structures with diffuse boundaries, such as emerging cell condensations or molecular gradients, are described as spatial patterns of intensities. We applied this approach to microscopic images of the tail fins of larval and juvenile rainbow trout. Inter-individual variation of shape and cell density was found highly spatially structured across the tail fin and temporally dynamic throughout the investigated period.
FIGURE 3 a-b in A geometric morphometric evaluation on three populations of endemic species Dorcadion micans (Cerambycidae, Coleoptera) in Ankara Province from Turkey with a new subspecies description
FIGURE 3 a-b. Principal components scatter plots of elytra (a) and pronotum (b)
FIGURE 7 in A geometric morphometric evaluation on three populations of endemic species Dorcadion micans (Cerambycidae, Coleoptera) in Ankara Province from Turkey with a new subspecies description
FIGURE 7. Habitus of Dorcadion micans majoripunctum ssp. nov., paratypes (females), dorsal view.
Figure 2 in The geometric morphometrics and condition of Pontic shad, Alosa immaculata (Pisces: Clupeidae) migrants to the Danube River
Figure 2. Comparison of all shape-related variables between years and sexes.
Figure 5 in Taxonomic revision of the Hydroporus bodemeyeri species complex (Coleoptera: Dytiscidae) with a geometric morphometric analysis of body shape within the group
Figure 5. Cluster analysis of average body shapes of examined taxa (Euclidean distance, UPGMA).
Figure 6 in Taxonomic revision of the Hydroporus bodemeyeri species complex (Coleoptera: Dytiscidae) with a geometric morphometric analysis of body shape within the group
Figure 6. Distribution of the species of the H. bodemeyeri species complex.
Figure 8 in Mandible shape in marsupial and placental carnivorous mammals: a morphological comparative study using geometric morphometrics
Figure 8. Simplified phylogeny showing the optimization of mandible shape on the main clades.
Figure 5 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 5. Shape differences in the skulls of Ctenomys torquatus and Ctenomys pearsoni: columns correspond to dorsal, ventral, and lateral views, respectively. The first row corresponds to the intersexual patterns of shape variation between male (grey lines) and female (dark lines) specimens. The second row represents interspecific patterns of shape variation between C. torquatus (dark lines) and C. pearsoni (grey lines). The third and fourth rows correspond to intraspecific differences between populations of C. torquatus with 2n = 44 from Brazil (grey lines) and from Uruguay (44u) (dark lines), and populations of C. pearsoni with 2n = 70 (dark lines) and 2n = 66 (grey lines), respectively. The shape differences are amplified ¥ 2.
Figure 1 in Intra- and interspecific skull variation in two sister species of the subterranean rodent genus Ctenomys (Rodentia, Ctenomyidae): coupling geometric morphometrics and chromosomal polymorphism
Figure 1. Map with sampled populations of Ctenomys torquatus from southern Brazil (1–17) and northern Uruguay (18–20), and for Ctenomys pearsoni (21–23) from southern Uruguay. Detailed information of voucher specimens are listed in Appendix 1, following the map numbering.
Figure 3 in Evolution of the zygomasseteric construction in Rodentia, as revealed by a geometric morphometric analysis of the mandible of Graphiurus (Rodentia, Gliridae)
Figure 3. Shape differentiation of the mandible on the first two axes of the PCA on mean species centroid coordinates. Outlines are reconstructed on the first two principal components; light grey outline represents the maximum values of the axes, dark grey outline corresponds to extreme reconstruction. Solid symbols indicate families with hystricomorphous skull: squares, Anomaluridae; rhombi, Ctenodactylidae; circles, Pedetidae; triangles, Dipodidae; stars, Graphiurinae. Open symbols indicate myomorph families: stars, Gliridae (Glirinae/Leithiinae); rhombi, Nesomyidae; circles, Muridae; triangles, Cricetidae. Upper left, mean projection for each family, with the minimum spanning tree.
Figure 5 in Evolution of the zygomasseteric construction in Rodentia, as revealed by a geometric morphometric analysis of the mandible of Graphiurus (Rodentia, Gliridae)
Figure 5. Mapping of the four infraorbital structures on a phylogenetic tree derived from Huchon et al. (2002) and Adkins et al. (2003). Boxes: dashed, protrogomorphous condition; white, sciuromorphous condition; light grey, hystricomorphous condition; dark grey, myomorphous condition. Abbreviations: iof, infraorbital foramen; zp, zygomatic plate.
Figure 6 from: Edgecombe G, Lopez Gutierrez B, MacLeod N (2011) Detecting taxonomic signal in an under-utilised character system: geometric morphometrics of the forcipular coxae of Scutigeromorpha (Chilopoda). ZooKeys 156: 49-66. https://doi.org/10.3897/zookeys.156.1997
Figure 6 - Strobe models of five positions along the canonical variates indicated in Fig. 5. CV-1, CV-2, and CV-3 axes account for 79.5% of the observed between-species shape variation. Landmarks and semi-landmarks are superimposed in the figure to the right of each sequence to express the magnitudes and directions (arrows) of shape trends. In all models, the mesial margin of the coxa is depicted to the left, the lateral margin to the right.
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